Answer:
B, A, C
Step-by-step explanation:
That's a 30-60-90 triangle.
3 , 2, 1/5
the third takes the images the quickest
2×10¹² cells → 90 g
mass of 1 red blood cell : 90÷(2×10¹²) = 45×10^-12 g = 4.5×10^-11 g
